Pyrope
Chemical Formula	Mg3Al2(SiO4)3
Species	Silicates
Crystal System	Isometric
Mohs Scale	7
Specific Gravity	3.78
Color	Red. Some varieties are very dark, almost black, while others can take tones of purple. Some chromium-rich pyropes are thermochromic, becoming green when heated[1]
Streak	White
Luster	Vitreous
Refractive Index	1.74 normal, but ranges from 1.714 to over 1.742 [2]
Cleavage	None
Fracture	Conchoidal
Crystal Habit：Euhedra typically display rhombic dodecahedral form, but trapezohedra are not uncommon, and hexoctahedra are seen in some rare samples. Massive and granular forms also occur.